NDAEB EXAM 2026/2027 QUESTIONS AND ANSWER KEY
(VERIFIED)
Comprehensive Assessment
Year: 2026–2027 | Total Questions: 150 | 100% VERIFIED
Introduction
The National Dental Assisting Examining Board (NDAEB) examination is the standardized
national certification assessment for dental assistants seeking to demonstrate entry-to-
work competency across Canadian provinces and territories. This comprehensive question
bank covers all key domains of the official NDAEB blueprint: (1) Collection and Recording of
Clinical Data, encompassing vital signs, dental charting, radiographic techniques, patient
health history assessment, and digital imaging; (2) Assisting with Diagnostic and
Therapeutic Procedures, including instrument transfer, high-volume evacuation, four-
handed dentistry, dental materials, prophylaxis assistance, and patient monitoring; (3)
Assisting with Restorative Procedures, covering amalgam and composite placement
assistance, matrix systems, bonding protocols, impression techniques, and temporary
restorations; (4) Assisting with Specialized Procedures, addressing endodontic, orthodontic,
periodontal, surgical, pediatric, and prosthodontic procedure support; (5) Dental Office
Administration and Preventive Dentistry, including patient education, scheduling, insurance
processing, preventive strategies, and emergency preparedness; (6) Infection Control,
covering sterilization methods, instrument processing, surface disinfection, personal
protective equipment, waterline maintenance, and occupational safety; and (7) Canadian
Dental Assisting Ethics, encompassing patient welfare, informed consent, confidentiality,
professional boundaries, mandatory reporting, scope limitations, and regulatory
compliance. Each of the 150 questions is mapped to a distinct sub-topic within the NDAEB
domain blueprint, ensuring thorough, non-overlapping coverage. Achieving NDAEB
certification demonstrates professional readiness for competent, ethical, and safe clinical
dental assisting operations across all Canadian jurisdictions.
Question 1: The dental assistant is taking a patient's blood pressure and obtains a reading
of 180/110 mmHg. This reading is classified as:
A. Hypertensive crisis requiring immediate notification of the dentist before
treatment proceeds
B. Mildly elevated and of no concern
C. Normal blood pressure
, D. Low blood pressure indicating possible shock
Correct Answer: A. Hypertensive crisis requiring immediate notification of the
dentist before treatment proceeds
Rationale: 180/110 mmHg constitutes a hypertensive crisis (Stage 2 or higher). Normal is
below 120/80 (A). It is significantly more than mildly elevated (C). Low blood pressure (D)
would present with readings well below 90/60.
Question 2: When taking a patient's pulse, the dental assistant counts for 30 seconds and
obtains 42 beats. The recorded pulse rate should be:
A. 21 beats per minute
B. 84 beats per minute
C. 42 beats per minute
D. 126 beats per minute
Correct Answer: B. 84 beats per minute
Rationale: Multiply the 30-second count by 2: 42 × 2 = 84 bpm. Recording only the 30-
second count (A), halving it (C), or tripling it (D) produces incorrect values.
Question 3: A periapical radiograph is PRIMARILY used to:
A. Show the relationship between unerupted third molars and the mandibular canal
B. Evaluate the entire tooth structure, root apex, and surrounding periapical
bone
C. Image the temporomandibular joint exclusively
D. Display only the crowns of multiple teeth for caries detection
Correct Answer: B. Evaluate the entire tooth structure, root apex, and surrounding
periapical bone
Rationale: Periapical radiographs capture the complete tooth and periapical area.
Panoramic radiographs (A) show third molar relationships. Bitewing radiographs (C) show
interproximal crowns. TMJ imaging (D) requires specialized views.
Question 4: The paralleling technique for periapical radiographs requires the film or sensor
to be positioned:
, A. Parallel to the long axis of the tooth with the central ray directed
perpendicular to both the tooth and the film
B. Touching the tooth surface at a 45-degree angle
C. Outside the patient's mouth against the cheek
D. Horizontally across the occlusal plane
Correct Answer: A. Parallel to the long axis of the tooth with the central ray directed
perpendicular to both the tooth and the film
Rationale: Paralleling positions the receptor parallel to the tooth with a perpendicular
beam, producing the most accurate image. Touching at 45 degrees (A) describes the
bisecting angle technique. Horizontal positioning (C) is for occlusal views. External
placement (D) would not capture the tooth.
Question 5: The normal adult respiration rate at rest is approximately:
A. 30-40 breaths per minute
B. 12-20 breaths per minute
C. 6-8 breaths per minute
D. 50-60 breaths per minute
Correct Answer: B. 12-20 breaths per minute
Rationale: Normal adult resting respiration is 12-20 breaths per minute. 6-8 (A) indicates
bradypnea. 30-40 (C) and 50-60 (D) represent tachypnea or respiratory distress.
Question 6: When recording dental charting, a tooth that has been extracted is indicated
by:
A. Coloring the entire tooth outline in blue
B. Drawing an X through the tooth or placing a single line through it per the
charting system used
C. Leaving the tooth symbol completely blank
D. Drawing a circle around the tooth number only
Correct Answer: B. Drawing an X through the tooth or placing a single line through it
per the charting system used
, Rationale: Standard dental charting marks extracted teeth with an X. Blue coloring (A) may
indicate existing restorations in some systems. Blank symbols (C) indicate present,
unrestored teeth. Circling the number (D) is not a standard convention.
Question 7: A bitewing radiograph is MOST useful for detecting:
A. Periapical pathology at the root apex
B. Interproximal caries and alveolar bone crest levels between teeth
C. Impacted supernumerary teeth in the palate
D. Fractures of the mandibular condyle
Correct Answer: B. Interproximal caries and alveolar bone crest levels between teeth
Rationale: Bitewings are designed for interproximal caries detection and crestal bone
assessment. Periapical pathology (A) requires periapical views. Impacted teeth (C) need
occlusal or panoramic views. Condyle fractures (D) require panoramic or CT imaging.
Question 8: The ALARA principle in dental radiography stands for:
A. Absolutely Lethal And Risky Approach
B. Always Limit All Radiation Amounts
C. As Low As Reasonably Achievable — keeping radiation exposure to the
minimum necessary for diagnostic quality
D. All Lateral And Retrograde Angles
Correct Answer: C. As Low As Reasonably Achievable — keeping radiation exposure
to the minimum necessary for diagnostic quality
Rationale: ALARA guides minimizing radiation exposure while maintaining diagnostic
quality. The other options are fabricated meanings.
Question 9: An oral temperature of 38.5°C (101.3°F) in an adult patient indicates:
A. A fever that should be documented and reported to the dentist before
proceeding with treatment
B. A perfectly normal body temperature
C. Hypothermia requiring warming measures
(VERIFIED)
Comprehensive Assessment
Year: 2026–2027 | Total Questions: 150 | 100% VERIFIED
Introduction
The National Dental Assisting Examining Board (NDAEB) examination is the standardized
national certification assessment for dental assistants seeking to demonstrate entry-to-
work competency across Canadian provinces and territories. This comprehensive question
bank covers all key domains of the official NDAEB blueprint: (1) Collection and Recording of
Clinical Data, encompassing vital signs, dental charting, radiographic techniques, patient
health history assessment, and digital imaging; (2) Assisting with Diagnostic and
Therapeutic Procedures, including instrument transfer, high-volume evacuation, four-
handed dentistry, dental materials, prophylaxis assistance, and patient monitoring; (3)
Assisting with Restorative Procedures, covering amalgam and composite placement
assistance, matrix systems, bonding protocols, impression techniques, and temporary
restorations; (4) Assisting with Specialized Procedures, addressing endodontic, orthodontic,
periodontal, surgical, pediatric, and prosthodontic procedure support; (5) Dental Office
Administration and Preventive Dentistry, including patient education, scheduling, insurance
processing, preventive strategies, and emergency preparedness; (6) Infection Control,
covering sterilization methods, instrument processing, surface disinfection, personal
protective equipment, waterline maintenance, and occupational safety; and (7) Canadian
Dental Assisting Ethics, encompassing patient welfare, informed consent, confidentiality,
professional boundaries, mandatory reporting, scope limitations, and regulatory
compliance. Each of the 150 questions is mapped to a distinct sub-topic within the NDAEB
domain blueprint, ensuring thorough, non-overlapping coverage. Achieving NDAEB
certification demonstrates professional readiness for competent, ethical, and safe clinical
dental assisting operations across all Canadian jurisdictions.
Question 1: The dental assistant is taking a patient's blood pressure and obtains a reading
of 180/110 mmHg. This reading is classified as:
A. Hypertensive crisis requiring immediate notification of the dentist before
treatment proceeds
B. Mildly elevated and of no concern
C. Normal blood pressure
, D. Low blood pressure indicating possible shock
Correct Answer: A. Hypertensive crisis requiring immediate notification of the
dentist before treatment proceeds
Rationale: 180/110 mmHg constitutes a hypertensive crisis (Stage 2 or higher). Normal is
below 120/80 (A). It is significantly more than mildly elevated (C). Low blood pressure (D)
would present with readings well below 90/60.
Question 2: When taking a patient's pulse, the dental assistant counts for 30 seconds and
obtains 42 beats. The recorded pulse rate should be:
A. 21 beats per minute
B. 84 beats per minute
C. 42 beats per minute
D. 126 beats per minute
Correct Answer: B. 84 beats per minute
Rationale: Multiply the 30-second count by 2: 42 × 2 = 84 bpm. Recording only the 30-
second count (A), halving it (C), or tripling it (D) produces incorrect values.
Question 3: A periapical radiograph is PRIMARILY used to:
A. Show the relationship between unerupted third molars and the mandibular canal
B. Evaluate the entire tooth structure, root apex, and surrounding periapical
bone
C. Image the temporomandibular joint exclusively
D. Display only the crowns of multiple teeth for caries detection
Correct Answer: B. Evaluate the entire tooth structure, root apex, and surrounding
periapical bone
Rationale: Periapical radiographs capture the complete tooth and periapical area.
Panoramic radiographs (A) show third molar relationships. Bitewing radiographs (C) show
interproximal crowns. TMJ imaging (D) requires specialized views.
Question 4: The paralleling technique for periapical radiographs requires the film or sensor
to be positioned:
, A. Parallel to the long axis of the tooth with the central ray directed
perpendicular to both the tooth and the film
B. Touching the tooth surface at a 45-degree angle
C. Outside the patient's mouth against the cheek
D. Horizontally across the occlusal plane
Correct Answer: A. Parallel to the long axis of the tooth with the central ray directed
perpendicular to both the tooth and the film
Rationale: Paralleling positions the receptor parallel to the tooth with a perpendicular
beam, producing the most accurate image. Touching at 45 degrees (A) describes the
bisecting angle technique. Horizontal positioning (C) is for occlusal views. External
placement (D) would not capture the tooth.
Question 5: The normal adult respiration rate at rest is approximately:
A. 30-40 breaths per minute
B. 12-20 breaths per minute
C. 6-8 breaths per minute
D. 50-60 breaths per minute
Correct Answer: B. 12-20 breaths per minute
Rationale: Normal adult resting respiration is 12-20 breaths per minute. 6-8 (A) indicates
bradypnea. 30-40 (C) and 50-60 (D) represent tachypnea or respiratory distress.
Question 6: When recording dental charting, a tooth that has been extracted is indicated
by:
A. Coloring the entire tooth outline in blue
B. Drawing an X through the tooth or placing a single line through it per the
charting system used
C. Leaving the tooth symbol completely blank
D. Drawing a circle around the tooth number only
Correct Answer: B. Drawing an X through the tooth or placing a single line through it
per the charting system used
, Rationale: Standard dental charting marks extracted teeth with an X. Blue coloring (A) may
indicate existing restorations in some systems. Blank symbols (C) indicate present,
unrestored teeth. Circling the number (D) is not a standard convention.
Question 7: A bitewing radiograph is MOST useful for detecting:
A. Periapical pathology at the root apex
B. Interproximal caries and alveolar bone crest levels between teeth
C. Impacted supernumerary teeth in the palate
D. Fractures of the mandibular condyle
Correct Answer: B. Interproximal caries and alveolar bone crest levels between teeth
Rationale: Bitewings are designed for interproximal caries detection and crestal bone
assessment. Periapical pathology (A) requires periapical views. Impacted teeth (C) need
occlusal or panoramic views. Condyle fractures (D) require panoramic or CT imaging.
Question 8: The ALARA principle in dental radiography stands for:
A. Absolutely Lethal And Risky Approach
B. Always Limit All Radiation Amounts
C. As Low As Reasonably Achievable — keeping radiation exposure to the
minimum necessary for diagnostic quality
D. All Lateral And Retrograde Angles
Correct Answer: C. As Low As Reasonably Achievable — keeping radiation exposure
to the minimum necessary for diagnostic quality
Rationale: ALARA guides minimizing radiation exposure while maintaining diagnostic
quality. The other options are fabricated meanings.
Question 9: An oral temperature of 38.5°C (101.3°F) in an adult patient indicates:
A. A fever that should be documented and reported to the dentist before
proceeding with treatment
B. A perfectly normal body temperature
C. Hypothermia requiring warming measures
